Bosch VP30 VP44 injection pump repair solution

[Don Fatso]

Hi!
This is my first post and I am not responding to the previous message. The issue is this article:

HOW TO DIAGNOSE VP44 FUEL SYSTEM ISSUES

Removed the text due to error. See next message.

[Don Fatso]

Hi!
This is my first post and I am not responding to the previous message. The issue is this article:

HOW TO DIAGNOSE VP44 FUEL SYSTEM ISSUES

And I quote:


An interesting fact to note is, IF THE INJECTION PUMP HAS ONLY
BATTERY POWER AND A GROUND, THE ENGINE SHOULD START AND
IDLE, which means it does NOT need any sensor like an APPS, MAP
Sensor, Crankshaft Sensor, Cam Sensor or even an ECM or a PCM to
make it start, AS LONG AS THERE HAS BEEN NO AIR INTRODUCED
INTO THE FUEL SUPPLY LINE! As there is a mechanical lift pump built
into the front of the injection pump the electric lift pump need not run
to make the truck start. This helps us a lot in diagnosing a hard or no
start VP44 equipped truck, doesn?t it!
If you are confident that you have electrical power and fuel to the
injection pump, loosen three injector lines at the valve cover. Crank
the engine a few times for 30 seconds each time, and if fuel only
comes out of one line this indicates a seized rotor.

My understanding of this is: remove the connector from the VP44 control unit and feed ONLY +12V and 0V towards the pump ( not towards the control unit ). Then no sensor of any kind, no immobilizer etc. can stop the pump from injecting fuel provided there is no air in the system and provided the rotor is not stuck nor any other mechanical failure. Wrong timing would stop starting of course.

If this is true, and Ithink it is, there is a simple way of checking whether the pump itself or the control unit is faulty. According to the text the engine will idle in this condition provided the pump is "mechanically ok".

There are quite many other hands on advices in the article so take a look!

[vey81]

Hi guys,
please help me with this.


Audi 2.5tdi, MY 2003.
Control Module Part Number: 8E0 907 401 M

3 Faults Found

01318 - Control Module for Injection Pump (J399)
03-00 - No Signal
01318 - Control Module for Injection Pump (J399)
49-00 - No Communications
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-00 -

in block 18 read as follows:

Supply voltage injection pump - 0.00V
Supply voltage from ECM - 11.83V.

Fuses O.K., supply and GND on conector is O.K, CAN is 120 ohm, original MOSFET is ok.
Pump doesn't communicate via k-line [focom, op-com, vr diag], and even after the power is there no sound as the other PSG5.

Is there any chance how to wake up the pump unit?

Thanks for your help

[viki300]

have fixed the problem on newer manufactured pumps! and those with 2 terminals no longer spoil this part

so no more transitor or mosfet problem on these 3 wire pump ecus i got one which is dead aswell

[viki300]

Hello I have received this module to test. I have wired and I think it is ok, car should have another problem...but it is very curious to see this original transistor has 2 aluminium wires for 1 transistor leg ( totally 3) .....all other ecus I have repaired only have 1 alu wire to each leg of transistor...

One image is clear:

Ref Bosch 0281010888 345167 881151

Any opinion? Its first time I see it!!

did you find any solution for this i got similar case here

[obdsystems]

I've repaired 3 VP44 pumps and guess what -

all 3 failed again. Longest lasting a month !!!!



My background is electronics so the job was well done and used Diesel cleaner.


- transistor runs so hot the solder melts and with vibration this suggested repair doesn't work.
Don't try this fix guys - it won't work !!!

[simaservis1108]

What kind of solder did you use?

[obdsystems]

What kind of solder did you use?

decent lead based. i pray last one i re-fixed will last cos this has damaged my reputation

I know my stuff - i was electronic engineer before doing this

If the actual pump really is going the FET overheats, as always on.

You maybe ok, mabe not, it's a lottery guys -
Just be aware!!!

[simaservis1108]

Use Alusol,lead won't work,too low melt temperature.

[obdsystems]

Use Alusol,lead won't work,too low melt temperature.

good advice.

One job lasted a month, another 1/2 a day. So something else I'm convinced is going on like the physical pump can be faulty.

I don't think the electrics is always the cause of original fault.

Last job I've given him plenty of cleaner so we shall see
In his cause the connection on top of the FET was bust, so maybe ok

[simaservis1108]

Alusol works 100%.
I have repaired many ECM and TCM modules.
IAW5XX ECU,one is going strong 3 years now.

[Remi55]

Why not put the Mosfet's outside the ECU on a big heatsink like done here once before This will absorb the head and should prevent overheating of this type.

[Meat-Head]

Why not put the Mosfet's outside the ECU e.

Emeinen would go round the out side, round the outside.

the Wombles, they go over ground if they can't go under ground

[Alex79]

Alusol works 100%.
I have repaired many ECM and TCM modules.
IAW5XX ECU,one is going strong 3 years now.

Where to find Alusol ?

[Johnner]

http://www.stannol.de/en/products/so...ler%5D=Product